地下风道空气析湿量数值计算方法
Numerical calculation method of air condensation amount in underground tunnel
摘要：
针对现有地下风道空气析湿量计算模型及方法的不足，提出以数值计算为基础的空气析湿量计算方法。分析了空气在风道内的析湿过程，建立了热湿交换数学模型，将空气状态方程与热湿交换方程进行联立形成控制方程组，采用单元分割法对控制方程组进行离散求解，对不同风道深度、不同时刻的空气析湿量进行动态计算。经实测验证，数值计算结果与实测结果吻合较好，数值计算结果的平均相对误差为1.66%。计算和实测表明，风道前端，气流等湿冷却，无水分析出；风道后端，气流减湿冷却，析湿量沿程减小。
Abstract：
In view of the shortage of the existing calculation model and method of air condensation amount, presents a calculation method based on numerical calculation. Analyses the air condensation process in underground tunnel, and establishes the mathematic models of heat and mass exchange. The governing equations composed of air state equation and heat and mass exchange equations are discretized based on cell division method and solved. Dynamically calculates air condensation amount in different tunnel depth at different time.Verification experiment shows that the numerical calculation results agree well with the testing results, and the average relative error of numerical calculation results is 1.66%. The results of numerical calculation and field measurement show that in the front part of the tunnel, the air is cooled in the constant humidity process without air condensation; in the end part of the tunnel, the air is in the process of dehumidifying cooling, and the condensation amount reduces gradually along the length direction of the tunnel.
Keywords:underground tunnel, air, condensation amount, numerical calculation, heat and mass exchange